Altera Integer Arithmetic IP - Manual (Page 40)

Figure 5-1: ALTECC_ENCODER Ports
data[]
inst
ALTECC_ENCODER
clocken
clock
q[]
aclr
Figure 5-2: ALTECC_DECODER Ports
data[]
inst
ALTECC_DECODER
clocken
clock
q[]
aclr
err_detected
err_corrected
err_fatal
ALTECC_ENCODER Features
The ALTECC_ENCODER megafunction offers the following features:
• Performs data encoding using the Hamming Coding scheme
• Supports data width of 2–64 bits
• Supports signed and unsigned data representation format
• Support pipelining with output latency of either one or two clock cycles
• Supports optional asynchronous clear and clock enable ports
The ALTECC_ENCODER megafunction takes in and encodes the data using the Hamming Coding
scheme. The Hamming Coding scheme derives the parity bits and appends them to the original data to
produce the output code word. The number of parity bits appended depends on the width of the data.
The following table lists the number of parity bits appended for different ranges of data widths. The Total
Bits column represents the total number of input data bits and appended parity bits.
Table 5-1: Number of Parity Bits and Code Word According to Data Width
Data Width Number of Parity Bits Total Bits (Code Word)
2-4 3+1 6-8
5-11 4+1 10-16
12-26 5+1 18-32
5-2 ALTECC_ENCODER Features
UG-01063
2014.12.19
Altera Corporation ALTECC (Error Correction Code: Encoder/Decoder)
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